Oral prophylactic



Patented Dec. 17, 1940 UNITED STATES PATENT OFFICE.

No Drawing. Application February 1, 1936, Se-

rial No. 61,893. Renewed February 21, 1940. In Canada February 9, 1935 2 Claims.

of oxygen is so controlled that its evolution in the presence of diseased tissue is gradual.

I attain my objects by combining an oxidizing agent such as sodium perborate, a substantially non-oxidizable oil and particularly a medicinal grade of petroleum oil, and a harmless reagent adapted to increase the surface tension of the suspension, such as auramine (British Drug Houses Ltd.) having the graphic formula The auramine also adds to the efficacy of the mixture since it is active as a germicide, protozoacide and amoebacide. The oil used is preferably of a viscosity no greater than that of the petroleum oil put on the market under the trade name of Nujo1" and preferably somewhat less. Viscosities between 10 to 30 S. A. E. have been found satisfactory. The test is the ability of the paste to creep by capillary action between the gums and teeth while the oil remains in proper admixture with the solid ingredients. Petroleum jellies do not produce th desired results. While the best results are obtained by using mineral oil, fatty animal and vegetable oils may be used provided they are or may be made substantially free from objectionable taste and odor and are substantially non-oxidizable in the presence of the oxidizing agent.

An innocuous food color is also preferably employed such as National Sitro Yellow (National Aniline Co.) and also a flavoring material such as oil of peppermint. In addition tov coloring the product, Sitro Yellow acts as a stabilizing reagent.

The preferred proportions are as follows:

011 flu.id 025.. 110 Sodium perborate lbs 10 Sitro yellow gram a %.-,no-%mm p rt by weight of the above total Glycerine Enough to dissolve the auramine having germicidal The proportions given are not critical and may be more or less varied, more particularly the coloring and flavoring. The quantity of auramine" which can be dispersed in the mixture de-- pends on the fineness of the perborate, and with 5 finely ground perborate up to #2 part by weight of auramine may be introduced into the mixture. The use of a quantity of auramine greater than part is objectionable since it would. tend to separate out and also to stain the gums. use of a quantity of "auramine less than part results in greatly decreased efficiency. I

In making the preparation I first grind the perborate to the required degree of fineness, then mix the perborate with the coloring material, then add the oil and mix to a paste. The auramine dissolved in glycerine is then incorporated. The flavoring may be added at any stage of the process.

For the auramine other synthetic dyestuffs and protozoacidal and/or amoebacidal qualities may be substituted, particularly those of the diphenylmethane series to which fauramine belongs provided they fulfil the most important function of the auramine,

which is what it increases the surface tension of the oil used and thus markedly increases the penetration of the mixture into, the capillary fissures or channels through which deep seated infection must be reached.

For the perborate may be used other chemicals that are oxidizing agents in solid form, such as magnesium peroxide.

It is important that a part at least ofthe perborate shouldbe of near colloidal fineness to give 86 it the greatest possible penetration under capillary attraction. It is preferable that the'great'er part of the perborate shall be no larger than bacterial size, say M in diameter in order that the perborate may be drawn by capillary pull 40 wherever bacteria are to be found. By grinding a part at least of the oxygen-liberating compound to substantially'bacterial fineness not only is there ensured ready penetration of th compound into capillary spaces but also an important additional advantage obtains in that settling and creeping is prevented. In-this connection, it has been found that when ordinary perborate powder I is used with oil the mixture tends to settle, the

The. 10'

Another result of the very ilne grinding is that a greatly increased surface of solid is obtained on which the auramine" is adsorbed. It is found that it is advantageousto drive oi! part of the water of crystallization from the perborate which is effected by heating the perborate, pref-v erably before mixing,to a temperature at or about 120" C. a suiiicient length of time to drive 01! about two-thirds oi .the water of crystallization. If heating is 'eiiected in vacuo the temperature may be lowered, so also other methods of dehydrating maybe employed as will be understood by chemists with knowledge of the art.

The eflect of this treatment is to further slow up the liberation of oxygen when the composition is used, thus spreading, in time, its remedialeffect.

It is thought that the treatment results in the a formation of borates having a diiferent number of molecules of water of crystallization and which give up oxygen at different rates. 7 I

It is thus possible to obtain diirerent results by removing more or less of the water of crystalliza tion and by mixing together batches of perborate from which diiierent proportions of thewater of crystallization havebeen removed. r In use it is found that the composition remains homogeneous in its consistency throughout the mws and that'when applied to the gums oradiacent tissues the oxidmng agent andthe "auramine are carried by capillary action to the affected partswith marked remedial eflect due to the gradual release of oxygen and thedirect action of the auramine.

The combination or the oil and oxidising agent without "auramine" gives an oral prophylactic of high oxidizing properties and considerable powers of penetration but is not nearly as eifective as when a suitable harmless reagent is employed toraisethesurfacetensicnofthesuspension.

Itwill beobviousthata prophylacticsuchas described maybeusefulinmanycaseswhereit isdesiredtocarryoxygenreleasingreagentsinto capillary spaces for prophylactic purposes.

What I claim as my inventionis:

1. An oral propby'lactlccanprlsing :a mixture ofaninorganicoxidisin'gagentinsolidfomsa lected iromthegroupmpdnng o m v i rate and peroxide; a substantially non-oxidizable oil; anda harmless reagent of the diphenyl-methane dyestuif series having the property of increasing the surface tension of the oil to increase its capillary penetration, which reagent has the formula nor-hike N(OHI)I t 2. An oral prophylactic comprising a mixture of an inorganic oxidizing agent in solid form. selected from thegroup comprising sodium perborate and magnesium peroxide: a substantially non-oxidizable oil; and sharpness reagent of the diphenyl-methanep dyestui! series having the property of increasing the suri'ace tension of the oil to increase its capillary penetration, which reagent has the formula @mcnm Nwnm and part at least of the oxidizing agent being of substantially colloidal fineness.

wnmsm M. M'oDONALD. 

